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A improved, simple and economic reverse phase high performance liquid chromatography (RP-HPLC) method has been developed and validated as per ICH guidelines for the quantification of acetic acid present in Gefitinib as an solvent impurity. Validation studies demonstrated that the proposed RP-HPLC method is simple, specific, rapid, reliable and reproducible. The high recovery and low relative standard deviation confirm the suitability of the proposed method for the routine quality control analysis for the quantification of acetic acid in Gefitinib.